Browning and dying segments on Arbor Vitae limbs

Asked August 14, 2018, 4:18 PM EDT

These pale spots appear regularly then brown and die. I do not see insects. I cut off segments as soon I see them, but whatever it is is spreading. What is this condition called and what can we do? They have been well watered and I don't think they have been stressed. Hope you have some ideas. Ken

Caroline County Maryland shrubs abiotic issues

1 Response

Your Arborvitae look like they are in decline. Several factors can contribute to this -- old age, too much shade and/or root decline. Stressful growing conditions -- drought, high heat, too much water -- all can contribute to these symptoms. Older Arborvitae do not recover very well from drought, for example, which we had prior to the excessive rain recently.
https://extension.umd.edu/hgic/environmental-stress-and-site-problems-trees-and-shrubs

ckc